Casing



FIG. 1 is a perspective view from the front, top, and right sides, with the legs folded;

FIG. 2 is a front, right side perspective view with the legs extended;

FIG. 3 is a right and top perspective view with the legs retracted;

FIG. 4 is a left and top perspective view with the legs retracted; and,

FIG. 5 is a front and top perspective view. 

CLAIM The ornamental design for a casing, as shown and described. 